Shaft voltage grounding protection structure of traction motor

A grounding protection, traction motor technology, applied in the connection with grounding devices, electrical components, electromechanical devices, etc., can solve the problems of difficult replacement of grounding devices, low space utilization, low product reliability, etc. Space utilization, obvious effect

Inactive Publication Date: 2020-02-21
CRRC YONGJI ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is used to solve the defects of the existing technology such as bare leakage of the grounding device, difficulty in replacing the grounding device, poor maintainability, low space utilization rate, and low product reliability, and effectively solve the problem of bearing damage and failure caused by shaft voltage from the source , improve the life of the bearing, improve the reliability of the motor product, and also have the function of grounding device protection and online replacement, which is convenient and efficient for maintenance

Method used

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  • Shaft voltage grounding protection structure of traction motor
  • Shaft voltage grounding protection structure of traction motor
  • Shaft voltage grounding protection structure of traction motor

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Embodiment Construction

[0025] like figure 2 , image 3 As shown, the present invention includes a speed measuring gear 1, a grounding ring 2, a gear cover cover plate 3, and a gear cover 4. The speed measuring gear 1 is installed on the non-transmission end of the motor shaft 6, and the gear cover 4 is installed on the base shell 5. The gear cover cover plate 3 is installed on the gear cover 4, the grounding ring 2 is installed on the inner side of the gear cover cover plate 3, and the machine base shell 5 is fixed on the train.

[0026] The base shell 5 and the motor shaft 6 are connected to the grounding ring 2, the gear cover cover plate 3 and the gear cover 4 through the annular structure protruding from the speed measuring gear 1, so that they maintain zero potential at the same time and cannot form a current loop, thereby Avoid shaft voltage and shaft current.

[0027] The base shell 5 is connected with the gear cover 4 through conductive metal bolts.

[0028] The gear cover 4 and the gear...

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Abstract

The invention belongs to the field of electromechanical equipment safety protection, relates to a motor shaft grounding structure, and particularly relates to a shaft voltage grounding protection structure of a traction motor. The shaft voltage grounding protection structure of a traction motor comprises a speed measuring gear, a gear cover, a gear cover plate and a grounding ring. The speed measuring gear is installed at the non-transmission end of a motor shaft. The gear cover is installed on a motor base shell. The gear cover plate is installed on the gear cover. The grounding ring is installed on the inner side of the gear cover plate, and is in contact with the speed measuring gear. The motor shaft and the motor base shell are connected through the speed measuring gear, the groundingring, the gear cover plate and the gear cover. Zero potential is kept, a current loop cannot be formed, and a shaft voltage and a shaft current are prevented from being generated.

Description

technical field [0001] The invention belongs to the field of safety protection of electromechanical equipment, and in particular relates to a motor shaft grounding structure, in particular to a shaft voltage grounding protection structure of a traction motor. Background technique [0002] For traction motors powered by frequency converters, the generation of shaft voltage is unavoidable. The generation of shaft voltage breaks down the lubricating oil film on the surface of the bearing while the lubricating oil is electrolyzed, resulting in a decrease in the performance of the lubricating oil; and after the lubricating oil is broken down, a very high current will be generated on the tiny metal surface of the bearing raceway Density, extremely high heat is generated instantly, causing electric corrosion of bearings. With the increase of the running time of the motor, the electric corrosion of the bearing intensifies, and the washboard pattern is formed on the surface of the r...

Claims

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Application Information

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IPC IPC(8): H02K11/40H02K7/116H02K5/04
CPCH02K5/04H02K7/116H02K11/40
Inventor 李广李鹏郭岚岚
Owner CRRC YONGJI ELECTRIC CO LTD
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